<template>
  <!---->
  <li  @mouseenter="handleEnter(true)" @mouseleave="handleEnter(false)" :style="{background: bgColor}">
    <label>
      <input type="checkbox" v-model="todo.complete"/>
      <span>{{todo.title}}</span>
    </label>
    <button class="btn btn-danger" v-show="isShow" @click="deleteTodo">删除</button>
  </li>
</template>

<script>
  import PubSub from 'pubsub-js'
  export default {
    props:{
      todo:Object,
      index:Number,

    },
    data(){
      return{
        bgColor:'white',//默认背景的颜色
        isShow:false  //按钮默认是否显示
      }
    },
    methods:{
      handleEnter(isEnter){
        if(isEnter){
            this.bgColor='#aaaaaa',
              this.isShow=true
        }else{
          this.bgColor='white',
            this.isShow=false
        }
      },
      deleteTodo(){
        const{todo,index,deleteItem}=this
        if(window.confirm(`确认删除${todo.title}吗？`)){
          //deleteItem(index)
        //  发布消息
          PubSub.publish('deleteItem',index)
        }
      }
    }
  }
</script>

<style>
  /*item*/
  li {
    list-style: none;
    height: 36px;
    line-height: 36px;
    padding: 0 5px;
    border-bottom: 1px solid #ddd;
  }

  li label {
    float: left;
    cursor: pointer;
  }

  li label li input {
    vertical-align: middle;
    margin-right: 6px;
    position: relative;
    top: -1px;
  }

  li button {
    float: right;
    display: none;
    margin-top: 3px;
  }

  li:before {
    content: initial;
  }

  li:last-child {
    border-bottom: none;
  }
</style>
